Is a cradle used in mining?

Yes, a cradle is used in mining, specifically in the context of gold mining. Also known as a rocker box, it allows for the separation of gold and other heavy materials from lighter sediment. Water is poured into the cradle while it is rocked back and forth, helping to wash away the lighter materials and concentrate the heavier ones. This method was particularly popular during the gold rushes of the 19th century.